Stereotype-casting apparatus



(No Model.) A

J. R. CUMMINGS. I STE REOTHYPB GASTII TG APPARATUS. No. 416,717. Patented Dec. 10, 1889.

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UNITED STATES JOHN R. CUMMINGS, OF NEW YORK,

N. Y., ASSI'GNOR, BY MESNE ASSIGN- MENTS, TO THE AMERICAN PRESS ASSOCIATION, OF ILLINOIS.

STEREOTYPE CASTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 416,717, dated December 10, 1889.

Application filed January 8, 1888- Serial No. 259,745- (No model.)

To all whom it may concern.-

Be it known that I, J OHN R. CUMMINGS, of

New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Stereotype- Castlng Apparatus, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

In the process of casting stereotype-plates of newspaper size one of the difliculties heretofore necessary to contend with was due to the fact that when the casting apparatus became heated the metal of the mold expanded, whereas the papier-mach matrix contracted, thus causing the matrix to go out of register with the configurations of the mold in the box, and producing a plate the columns of WhlCl], when separated therefrom, would be imperfect and moreor less diflicult to trim and groove.

The object of my invention is to maintain as long and as nearly as possible the original relat1ve position of the matrix and mold and to reduce to a minimum the possible defects due to the shrinkage of the matrix-i. a, displacement of the impression-surface of the plate from the body of the plate supporting it, substantially as hereinafter described.

In the drawings, Figure 1 is a transverse section of a section of casting-box havingmy lmprovements applied thereto. Fig. 2'is a s mllar view of a modification of my invent1on, and Fig. 3 isan end view of a stereotype plate with its side edges properly trimmed and cast in my improved casting apparatus.

In the drawings, G represents a papiermach matrix, preferably of a size corresponding to a page of newspaper matter of six columns width. This matrix is secured against the inner surface of the box of the casting apparatus longitudinally with reference to the formations of the cored inner surface of the cover Bin other words, so that the impression or type surface of each column of matter in the matrix will be in longitudinal alignment and in register with the depressions in said cored surface of the cover B, which are to shape the legs and under part of a stereotype. The cored surface of cover B is divided longitudinally int-o rectangular oblong slabs or sections 1) b, which are about one-half an inch thick and of a width slightly longer than the length of a column of newspaper matter. These sections are placed side by side within the depressed area of the inner surface of the cover and in register with the matrix, so that the expan- 6o sion of the metal in each of them, when heated, will only be one-sixth or one-third of what the total expansion of the entire cored surface would be.

When I use the divided cored surface in conjunction with an integrant matrix, I prefer to make some formation of the matrix which will enable it to be held in perfectregister with .the coredsurface. This I do by providing a longitudinal head 01, which pro jects slightly from the casting-surface of the matrix, longitudinally and centrally between and parallel with the side edges of the adjacent columns of matter impressed in the matrix. This head (1 is only used when the cored surface is built out enough between each or every alternate column of matter to be cast therefrom, so as to press against said matrix. Such built-up surface of each section b,between the sides thereof, is provided with a longitudinal groove 6, into which bead d enters. Thus, when sections 1) of the cored surface expand, the matrix, which is held between said cored surfaces and the back of the box in which it is'placed and secured, shrinks, and such shrinkage is compensated by the space left between each section opposite and in register with which it may be placed. If desired, in addition to the bead d of the matrix, there may be similar beads g g, parallel with 0 and on both sides of it, which areremoved therefrom such a distance that they project just to either side of the built-up portion D of said divided cored surfaces, and, thus afford an additionalpurchase for the sections b to stretch it.

The heads (1 and 9 may be full length or only part of length of the column. It is sufficient if they enter the longitudinal groove or between the adjacent sides of the sections b.

That I claim as new is- 1. The combination, with a stereotype-casting box and a matrix, of a cover having its inner surface depressed or cut away back from the plane of its marginal edges which bear against said box, and an independently cored casting-surface divided longitudinally into a suitable number of sections placed within the said depressed inner surface of the cover with reference to said matrix, with sufficient space between the adjacent edges of each section topermit of a transverse eX- pansibility thereof independent of said cover, as set forth.

2. The combination, with a stereotypers casting-box and a matrix having a longitudinal bead between the columns of matter impressed therein, of a cover and the sections of cored casting-surface, as set forth.

3. The combination, with a st-ereotypers casting-box and a matrix havinglongitudinal beads, of a cover and the sections of cored casting-surface having longitudinal grooves therein made with reference to and in register with said beads of the matrix.

JOHN R. CUMMINGS.

Witnesses:

PORTER B. COOLIDGE, FRANK D. THOMASON. 

